Secondary Management Module Selection - Alcatel-Lucent OmniSwitch 6850 Series Hardware User's Manual

Managing OmniSwitch 6850 Series Stacks

Secondary Management Module Selection

In order to provide effective management module redundancy, all OmniSwitch 6850 Series stacked
configurations dynamically assign a backup, or secondary, management module during the boot process.
OmniSwitch 6850 Series stacks use two different methods for selecting the secondary switch. These meth-
ods are:
Stacking connection to the primary switch
•
Saved slot number
•
Using the Stacking Connection to the Primary Switch
By default, the switch that is connected to the primary switch's stacking port A is automatically assigned
the secondary management role. This applies to stacks on which there is no preassigned slot information—
i.e., there is no boot.slot.cfg file present in any switch.
For more information on using the stacking connection to the primary switch to determine the secondary
management module, refer to the diagram below:
Secondary Management Module Selection Using the Stacking Connection to the Primary Switch
Note. For information on dynamic slot numbering for idle elements within the stack, refer to
Role" on page 4-11 and
OmniSwitch 6850 Series Hardware Users Guide
A B
A B
00:d0:95:b2:3c:8e
00:d0:95:b2:2a:ab
00:d0:95:b2:1c:ff
(Primary - Slot 1)
00:d0:95:b2:5b:8d
A B
Idle
Idle
Primary
Secondary - Slot 2
"Slot Numbering" on page
August 2007
1 Four OmniSwitch 6850 Series switches are
stacked and connected via stacking cables, as
shown. All switches are currently powered off.
None of the switches have preassigned slot
numbers—i.e., there are no boot.slot.cfg files
present. The user powers on all switches in the
stack in close succession and the stack begins
the boot process.
When the elements in the stack come online,
2
the switch with the lowest MAC address is
given the primary management role and is
dynamically assigned slot number 1.
By default, the switch connected to the
3
primary's stacking port A is automatically
assigned the secondary management role.
The secondary switch is dynamically
assigned slot number 2.
4-19.
Roles Within the Stack
"Idle Module
page 4-9